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  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech

Spark Plug recommendations

  • Thread starter Thread starter Nicoleb3x3
  • Start date Start date Jun 21, 2009

Nicoleb3x3

Member
Jun 9, 2004
274
0
16
southern NH
Jun 21, 2009
#1
  • Jun 21, 2009
  • #1
Does anyone have recommendations for 5.0 n/a with AFR 165 heads and cobra intake and stock injectors? Also; 90mm mass air if that matters and also shorty unequal headers. No aftermarket ignition box, but I do have a fireball coil and summit billet distributor.

This is for my engine I just rebuilt in my 93.

looking for what the gap should be and if anyone has a recommended brand/part #.
 

Gearbanger 101

Straight Outta Locash
20+ Year Stangneter
Aug 10, 2002
9,457
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Ontario, Canada
Jun 21, 2009
#2
  • Jun 21, 2009
  • #2
The stock Motorcraft AWSF32C's should be just fine for your application. The stock gap is somewhere in the .048-.052 range if I'm not mistaken?
 
S

STP72

New Member
Nov 11, 2006
109
0
0
Jun 21, 2009
#3
  • Jun 21, 2009
  • #3
nothing but good look with OEM ford and autolites
 

Nicoleb3x3

Member
Jun 9, 2004
274
0
16
southern NH
Jun 21, 2009
#4
  • Jun 21, 2009
  • #4
makes sense to me

thx
 
N

NotchAbove

New Member
Jan 24, 2007
29
0
0
Jun 22, 2009
#5
  • Jun 22, 2009
  • #5
TFS, Edelbrock, and AFR Heads:
[14mm, 3/4" Reach, 5/8" Hex, gasket seat]
AUTOLITE
1 step colder--3924 (4) [*recommended starting point]
2 step colder--3923 (3)
-----AR3933 (3) [*recessed tip, racing plug]
-----AR3932 (2) [*recessed tip, racing plug]
-----AR3931 (1) [*recessed tip, racing plug]

NGK
1 step colder--(FR5) 3686 (5) [*recommended starting point]
2 step colder--(BKR6EY) 3696 (6)
-----(R5671A-8) 4554 (8) [*recessed tip, racing plug]
-----(R5671A-9) 5238 (9) [*recessed tip, racing plug]
-----(R5671A-10) 5820 (10) [*recessed tip, racing plug]

MOTORCRAFT
1 step colder--AWSF22C
2 step colder--AWSF32C
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,265
17,952
224
Massachusetts
Jun 22, 2009
#6
  • Jun 22, 2009
  • #6
Stock gap is 0.052 - 0.056"
 

Gearbanger 101

Straight Outta Locash
20+ Year Stangneter
Aug 10, 2002
9,457
1,377
234
Ontario, Canada
Jun 22, 2009
#7
  • Jun 22, 2009
  • #7
NotchAbove said:
AUTOLITE
1 step colder--3924 (4) [*recommended starting point]
2 step colder--3923 (


MOTORCRAFT
1 step colder--AWSF22C
2 step colder--AWSF32C
Click to expand...
This info is incorrect.

The Autolite plug heat ranges are as follows
3924 stock heat range
3923 is 1 heat range colder
3922 is 2 heat ranges colder

The Motorcraft plug heat rangers are as follows
AWSF-32C is the stock heat range in a copper plug
AWSF-22C is one heat range colder and
AWSF-12C is two heat ranges colder
 
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